RFR: 8361253: CommandLineOptionTest library should report observed values on failure

[Aleksey Shipilev]

On Wed, 2 Jul 2025 11:00:44 GMT, Manuel Hässig <mhaessig at openjdk.org> wrote:

> When a check in `CommandLineOptionTest` fails, the `AssertionError` message contains the expected value, but not the observed value. To reduce the amount of digging in the logs we have to do when analyzing a failure, this PR adds the observed value to the error messages. So instead of 
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> java.lang.AssertionError: Option 'CICompilerCount' is expected to have '12' value
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> a mismatch in the `CICompilerCount` will now print
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> java.lang.AssertionError: Option 'CICompilerCount' is expected to have '12' value, but is 'CICompilerCount = 6'.
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> Testing:
>  - [x] Github Actions
>  - [ ] tier1 through tier3 plus Oracle internal testing

Marked as reviewed by shade (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/26092#pullrequestreview-2978987090